Hi. I have a Wltoys 144001 and I need to know which oil weight the shocks are filled with from the factory please.
Sorry, I missed this thread, but I can help. I too have a 144001, brushless converted though. The stock shock oil is a little on the light side, especially in the rear, due to that big ol', heavy, power hungry 550 brushed motor. The stock oil is about 30-40wt, that's what most of us estimate. You might want to bump that up to 45wt at least if you want better dampening, and less chassis slap, and less rear-end-squat under acceleration. I got 50wt Losi shock oil, and put that in all four corners, but you can just put it in the back. The 50wt is probably a little too much, as the smaller brushless motor saves a lot of weight, but it works, and I rarely bottom out, but I don't do big jumps. Yeah, so if you're happy with the stock oil, get like a 40wt one, if it slaps a little, get a 45-50wt oil, and if you like jumps, and bottom out a lot, get a 60wt oil. The 144001 and 12401_ shocks have 4 piston holes, and are very free-flowing, so for anyone wondering why a 1/14 or 1/12 scale car needs a heavier oil than some 1/10 scales, that why!
I have this stuff, and the 2oz bottles are PLENTY, I've serviced the all the shocks 2 times now, so I've filled about 8 shocks, and I've only used about 1/3rd of the bottle! RC shocks really don't take much oil to fill, excluding the BIG scale cars.
You don't need to buy from Losi, buy your oil from whatever brand is most accessible and cheapest for you. However, it's recommended that you stick with the shock oil brand of your choice, as the weights vary slightly from brand to brand (wt is just an approximate weight rating that manufactures created, CST is more accurate as it's a common way of measuring the viscosity of a liquid), so if you pick Losi for your shock oil, try to stick with them, so buy from a brand that you'll be able to buy from again easily in the future.